I didn't realize those trails existed, the last time I was over there was April of 2015. You can see the State Park campground in the video, but there is a lot of free camping down the Little Horse Canyon Road that goes all the way to Caineville. Goblin Valley would make a good base camp.
There is the famous Factory Butte OHV area over there that might be a bit of fun on an eMTB. You could ride an eBike for weeks on the Jeep and motorcycle trails in the Swell.
Here is a trail in the Swell that is just a little more difficult:
I did 5MOH on my MTB about 10 years ago, I can't wait to get back over there with my eMTB.